D12674: Mark `Phonon4Qt5` dependency as optional in CMakeLists file

[Alexander Schlarb]

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REVISION SUMMARY
  Usage of Phonon is already optional in the source code; this commit updates the CMake file to reflect this. All tests pass with Phonon missing.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D12674

AFFECTED FILES
  CMakeLists.txt

To: tundracomp
Cc: #frameworks, michaelh, bruns
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